/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso;

import org.jpos.core.Configurable;
import org.jpos.core.Configuration;
import org.jpos.core.ConfigurationException;
import org.jpos.util.*;
import org.jpos.util.NameRegistrar.NotFoundException;

import java.io.IOException;

/**
 * Connector implements ISORequestListener
 * and forward all incoming messages to a given
 * destination MUX, or Channel handling back responses
 *
 * @author <a href="mailto:apr@cs.com.uy">Alejandro P. Revilla</a>
 * @version $Revision$ $Date$
 * @see org.jpos.iso.ISORequestListener
 */
public class Connector
		implements ISORequestListener, LogSource, Configurable {
	private Logger logger;
	private String realm;
	private boolean preserveSourceHeader = true;
	protected String muxName;
	protected String channelName;
	protected int timeout = 0;
	protected static ThreadPool pool;

	public Connector() {
		super();
	}

	public void setLogger(Logger logger, String realm) {
		this.logger = logger;
		this.realm = realm;
	}

	public String getRealm() {
		return realm;
	}

	public Logger getLogger() {
		return logger;
	}

	/**
	 * Destination can be a Channel or a MUX. If Destination is a Channel
	 * then timeout applies (used on ISORequest to get a Response).
	 * <ul>
	 * <li>destination-mux
	 * <li>destination-channel
	 * <li>timeout
	 * <li>poolsize
	 * </ul>
	 *
	 * @param cfg Configuration
	 */
	public void setConfiguration(Configuration cfg)
			throws ConfigurationException {
		timeout = cfg.getInt("timeout");
		if (pool == null)
			pool = new ThreadPool(1, cfg.getInt("poolsize", 10));
		muxName = cfg.get("destination-mux", null);
		channelName = cfg.get("destination-channel", null);
		preserveSourceHeader = cfg.getBoolean("preserve-source-header", true);
		if (muxName == null && channelName == null) {
			throw new ConfigurationException("Neither destination mux nor channel were specified.");
		}
	}

	protected class Process implements Runnable {
		ISOSource source;
		ISOMsg m;

		Process(ISOSource source, ISOMsg m) {
			super();
			this.source = source;
			this.m = m;
		}

		public void run() {
			LogEvent evt = new LogEvent(Connector.this,
					"connector-request-listener");
			try {
				ISOMsg c = (ISOMsg) m.clone();
				evt.addMessage(c);
				if (muxName != null) {
					MUX destMux = (MUX) NameRegistrar.get(muxName);
					ISOMsg response = destMux.request(c, timeout);
					if (response != null) {
						if (preserveSourceHeader)
							response.setHeader(c.getISOHeader());
						source.send(response);
					}
				} else if (channelName != null) {
					Channel destChannel = (Channel) NameRegistrar.get(channelName);
					destChannel.send(c);
				}
			} catch (ISOException e) {
				evt.addMessage(e);
			} catch (IOException e) {
				evt.addMessage(e);
			} catch (NotFoundException e) {
				evt.addMessage(e);
			}
			Logger.log(evt);
		}

	}

	public boolean process(ISOSource source, ISOMsg m) {
		if (pool == null)
			pool = new ThreadPool(1, 10);

		pool.execute(new Process(source, m));
		return true;
	}
}
